How is an amateur versus a professional defined in the context of sewing on Chol Hamoed?

HolidaysPesachChol Hamoed Laws

Synopsis

An amateur (hedyot) is one who is not quick in sewing work. A professional (uman) is one who can extract a full needle-full in one motion or can consistently aim stitches precisely.

Late Acharonim
Lenient
Strict
Lesser cited
Major authority

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